Đặt tính rồi tính 456,9 – 189,5 =... 12,345 – 6,78 = ... 345,6 – 234,5 = ... 5,12 – 1,234 = ... 134,2 – 67,8 = ... 67,89 – 23,4 = ... 167,9 – 78,9 = ... 123,56 – 56,78 = ... 456,7 – 345,1 =.

456,9 – 189,5 = 267,4

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,9}\\{189,5}\end{array}} \\\,\,\,267,4\end{array}\)

12,345 – 6,78 = 5,565

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{12,345}\\{6,78}\end{array}} \\\,\,\,\,\,\,5,565\end{array}\)

345,6 – 234,5 = 111,1

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{345,6}\\{234,5}\end{array}} \\\,\,\,\,\,111,1\end{array}\)

5,12 – 1,234 = 3,886

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{5,12}\\{\,\,\,1,234}\end{array}} \\\,\,\,\,\,\,3,886\end{array}\)

134,2 – 67,8 = 66,4

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{134,2}\\{\,\,67,8}\end{array}} \\\,\,\,\,\,\,66,4\end{array}\)

67,89 – 23,4 = 44,49

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{\,\,\,\,67,89}\\{23,4}\end{array}} \\\,\,\,\,\,\,\,44,49\end{array}\)

167,9 – 78,9 = 89

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{167,9}\\{78,9}\end{array}} \\\,\,\,\,\,89\end{array}\)

123,56 – 56,78 = 66,78

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{123,56}\\{\,\,56,78}\end{array}} \\\,\,\,\,\,\,66,78\end{array}\)

456,7 – 345,1 = 111,6

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{456,7}\\{345,1}\end{array}} \\\,\,\,\,\,111,6\end{array}\)

23,67 – 7,89 = 15,78

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{23,67}\\{\,\,7,89}\end{array}} \\\,\,\,\,15,78\end{array}\)

189,4 – 89,12 = 100,28

\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{189,4}\\{\,\,\,\,89,12}\end{array}} \\\,\,\,\,\,100,28\end{array}\)

5,678 – 2,34 = 3,338

\[\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{\,\,\,5,678}\\{2,34}\end{array}} \\\,\,\,\,\,\,\,3,338\end{array}\]